GEN1 VEC2 H/C Tuning Help

Much

Viper Owner
Joined
Nov 6, 2002
Posts
66
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0
Location
Austria
Hello

Maybe some one can help me ?

I have a 1994 Gen1 Viper with the following mods :

- Harland Sharp 1,7 Roller Rockers + PushRods

- 3" Belanger Headers + Spiralflow Muffler + Roeracing Muffler

- Gen2 ThrottleBodys
K&N Filters + SmoothTubes
Gen2 fuel injectors

- Under drive Crank Pulley

- Greg Good Stage3 Heads (Shaved + 0,027 Gaskets for 10:1 Compression Ratio + Ported + 2,020" / 1,600" Valves)
+ Flow 302 cfm intake , 232 cfm exhaust side.

- Wild Comp. Cam + Chris Jensen ECU tune

- New Bosch 044 Fuel Pump

- VEC2 fine tuning ???

Chris Tuned the Car very good , it runs great at idle and cruising , but is too lean at Wot in some RPM range

Its to lean at about 2-3000 Rpm ( 14,7 ) + 4-5000RPM (14 ) but its to Rich from 3-4000RPM , iam at +200% fuel from 2-3000 RPM and iam at -170% Fuel at 3-4000 RPM , +6ms at WOT
but there is no differrenc in AFR

At first i thought the Stock original Fuel Pump is to old and weak so i addet a new Bosch 044 ( Shoul support 600HP , and i dont think i have that much HP)
but it does not made a difference.

The only thing that made a Difference in AFR is when i addet +11% Fuel injectors Pulse (+111%)
The AFR come down 1 Full point from 15,7 to 14,7 but gets the AFR to Rich at 3-4000RPM

What could be the Probleme , Fuel injectors ? Fuel Pressure ?
Should i try a MSD Fuel pressure booster

I also have The Primer Timer Relay in the Car because i had the Hard starting Problem , could this cause a weak Fuel Pressure at WOT ?

Its hard for me to Understand when the Car is Rich at some RPM Range the Fuel Pressure cant be the Probleme , or is my thinking wrong ???

Maybe some VEC Tuning Experts can Help me out ??
I can send AFR Files ( ZEITRONIX ) and VEC2 Files per email

[email protected]

Greetings From Austria

Mike
 
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